package xiaohu.day0.HJ9;

import java.util.ArrayList;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int n = in.nextInt();
            ArrayList<Integer> arrayList = new ArrayList<>();
            while (n > 0) {
                int i=n %10;
                n=n/10;
                if (!arrayList.contains(i)) {
                    arrayList.add(i);
                }
            }
            arrayList.forEach(System.out::print);
        }
    }
}
